<template>
  <div class="play-bar" :class="{show:!toggle}">
    <div @click="toggle=!toggle" class="item-up" :class="{turn: toggle}">
      <svg class="icon">
        <use xlink:href="#icon-jiantou-xia-cuxiantiao"></use>
      </svg>
    </div>
    <div class="kongjian">
      <!-- 上一首 -->
      <div class="item" @click="prev">
        <svg class="icon">
          <use xlink:href="#icon-ziyuanldpi"></use>
        </svg>
      </div>
      <!-- 播放 -->
      <div class="item" @click="togglePlay">
        <svg class="icon">
          <use :xlink:href="playButtonUrl"></use>
        </svg>
      </div>
      <!-- 下一首 -->
      <div class="item" @click="next">
        <svg class="icon">
          <use xlink:href="#icon-ziyuanldpi1"></use>
        </svg>
      </div>
      <!-- 歌曲图片 -->
      <div class="item-img" @click="toLyric">
        <img :src="picUrl"/>
      </div>
      <!-- 播放进度 -->
      <div class="playing-speed">
        <!-- 播放开始时间 -->
        <div class="current-time">{{nowTime}}</div>
        <div class="progress-box">
          <div class="item-song-title">
            <div>{{this.title}}</div>
            <div>{{this.artist}}</div>
          </div>
          <div ref="progress" class="progress" @mousemove="mousemove">
            <!-- 进度条 -->
            <div ref="bg" class="bg" @click="updatemove">
              <div ref="curProgress" class="cur-progress" :style="{width:curLength+'%'}"></div>
            </div>
            <!-- 拖动的点点 -->
            <div ref="idot" class="idot" :style="{left:curLength+'%'}" @mousedown="mousedown" @mouseup="mouseup"></div>
          </div>
        </div>
        <!-- 播放结束时间 -->
        <div class="left-time">{{songTime}}</div>
        <!-- 音量 -->
        <div class="item item-volume">
          <svg v-if="volume == 0" class="icon">
            <use xlink:href="#icon-yinliangjingyinheix"></use>
          </svg>
          <svg v-else class="icon">
            <use xlink:href="#icon-yinliang1"></use>
          </svg>
          <el-slider class="volume" v-model="volume" :vertical="true"></el-slider>
        </div>
        <!-- 收藏 -->
        <div class="item" @click="collection">
          <svg :class="{active:isActive}" class="icon">
            <use xlink:href="#icon-xihuan-shi"></use>
          </svg>
        </div>
        <!-- 下载 -->
        <div class="item" @click="download">
          <svg class="icon">
            <use xlink:href="#icon-xiazai"></use>
          </svg>
        </div>
        <!-- 当前播放的歌曲列表 -->
        <div class="item" @click="changeAside">
          <svg class="icon">
            <use xlink:href="#icon-liebiao"></use>
          </svg>
        </div>

      </div>
    </div>
  </div>
</template>
<script>
  import {mapGetters} from 'vuex';
  import { download,setCollect,getCollectOfUserId } from '../api/index';

  export default {
    name: 'play-bar',
    data(){
      return {
        nowTime: '00:00',        //当前播放进度的时间
        songTime: '00:00',        //当前歌曲总时间
        curLength: 0,            //进度条的位置
        progressLength: 0,      //进度条的总长度
        mouseStartX:    0,      //拖拽开始位置
        tag: false,             //拖拽开始结束的标志，当开始拖拽，它的值才会变成true
        volume: 50,             //音量，默认一半
        toggle: true            //显示隐藏播放器页面
      }
    },
    computed: {
      ...mapGetters([
        'id',               //歌曲id
        'url',              //歌曲地址
        'isPlay',           //播放状态
        'playButtonUrl',   //播放状态的图标
        'picUrl',            //正在播放的音乐的图片
        'title',                  //歌名
        'artist',                 //歌手名
        'duration',                //音乐时长
        'curTime',                //当前音乐的播放位置
        'showAside',            //是否显示播放中的歌曲列表
        'listIndex',            //当前歌曲在歌单中的位置
        'listOfSongs',          //当前歌单列表
        'autoNext',             //自动播放下一首
        'loginIn',              //用户是否已登录
        'userId',               //当前登录用户的id
        'isActive',             //当前播放的歌曲是否已收藏
      ])
    },
    watch:{
      //切换播放状态的图标
      isPlay() {
        if(this.isPlay){
          this.$store.commit('setPlayButtonUrl', '#icon-zanting');
        }else{
          this.$store.commit('setPlayButtonUrl', '#icon-bofang');
        }
      },
      curTime(){
        this.nowTime = this.formatSeconds(this.curTime);
        this.songTime = this.formatSeconds(this.duration);
        this.curLength = (this.curTime / this.duration) *100;
      },
      //音量变化
      volume(){
        this.$store.commit('setVolume',this.volume / 100);
      },
      //自动播放下一首
      autoNext(){
        this.next();
      }
    },
    mounted(){
      this.progressLength = this.$refs.progress.getBoundingClientRect().width;
      document.querySelector('.item-volume').addEventListener('click',function(e){
        document.querySelector('.volume').classList.add('show-volume');
        e.stopPropagation();
      },false);
      document.querySelector('.volume').addEventListener('click',function(e){
        e.stopPropagation();
      },false);
      document.addEventListener('click',function(){
        document.querySelector('.volume').classList.remove('show-volume');
      },false);
    },
    methods: {
      //提示信息
      notify(title,type) {
        this.$notify({
          title: title,
          type: type
        })
      },
      //控制音乐播放、暂停
      togglePlay() {
        if(this.isPlay){
          this.$store.commit('setIsPlay', false);
        }else{
          this.$store.commit('setIsPlay', true);
        }
      },
      //解析时间
      formatSeconds(value){
        let theTime = parseInt(value);
        let result = '';    //返回值
        let hour = parseInt(theTime / 3600);    //小时
        let minute = parseInt((theTime / 60) % 60); //分钟
        let second = parseInt(theTime % 60);        //秒
        if(hour > 0){
          if(hour < 10){
            result = '0' + hour + ":";
          }else{
            result = hour + ":";
          }
        }
        if(minute > 0){
          if(minute < 10){
            result += "0" + minute + ":";
          }else{
            result += minute + ":";
          }
        }else{
          result += "00:";
        }
        if(second > 0){
          if(second < 10){
            result += "0" + second;
          }else{
            result += second;
          }
        }else{
          result += "00";
        }
        return result;
      },
      //拖拽开始
      mousedown(e){
        this.mouseStartX = e.clientX;
        this.tag = true;
      },
      //拖拽结束
      mouseup(){
        this.tag = false;
      },
      //拖拽中
      mousemove(e){
        if(!this.duration){
          return false;
        }
        if(this.tag){
          let movementX = e.clientX - this.mouseStartX;       //点点移动的距离
          let curLength = this.$refs.curProgress.getBoundingClientRect().width;
          let newPercent = ((movementX+curLength)/this.progressLength)*100;
          if(newPercent>100){
            newPercent = 100;
          }
          this.curLength = newPercent;
          this.mouseStartX = e.clientX;
          this.changeTime(newPercent);
        }
      },
      //更改歌曲进度
      changeTime(percent){
        let newCurTime = (percent*0.01)* this.duration;
        this.$store.commit('setChangeTime',newCurTime);
      },
      //点击播放条切换播放进度
      updatemove(e){
        if(!this.tag){
          //进度条的左侧坐标
          let curLength = this.$refs.bg.offsetLeft;
          let newPercent = ((e.clientX - curLength) / this.progressLength) * 100;
          if(newPercent>100){
            newPercent = 100;
          }else if(newPercent<0){
            newPercent = 0;
          }
          this.curLength = newPercent;
          this.changeTime(newPercent);
        }
      },
      //显示播放中的歌曲列表
      changeAside(){
        this.$store.commit('setShowAside',true);
      },
      //上一首
      prev(){
        if(this.listIndex != -1 && this.listOfSongs.length > 1){    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
          if(this.listIndex > 0){                                 //不是第一首音乐
            this.$store.commit('setListIndex',this.listIndex - 1);  //直接返回上一首
          }else{                                                  //当前是第一首音乐
            this.$store.commit('setListIndex',this.listOfSongs.length - 1);  //切换到倒数第一首
          }
          this.toplay(this.listOfSongs[this.listIndex].url);
        }
      },
      //下一首
      next(){
        if(this.listIndex != -1 && this.listOfSongs.length > 1){    //当前处于不可能状态或者只有只有一首音乐的时候不执行）
          if(this.listIndex < this.listOfSongs.length - 1){                                 //不是最后一首音乐
            this.$store.commit('setListIndex',this.listIndex + 1);  //直接返回下一首
          }else{                                                      //当前是最后一首音乐
            this.$store.commit('setListIndex',0);  //切换到第一首
          }
          this.toplay(this.listOfSongs[this.listIndex].url);
        }
      },
      //播放音乐
      toplay: function(url){
        if(url && url != this.url){
          this.$store.commit('setId',this.listOfSongs[this.listIndex].id);
          this.$store.commit('setUrl',this.$store.state.configure.HOST+url);
          this.$store.commit('setPicUrl',this.$store.state.configure.HOST+this.listOfSongs[this.listIndex].pic);
          this.$store.commit('setTitle',this.replaceFName(this.listOfSongs[this.listIndex].name));
          this.$store.commit('setArtist',this.replaceLName(this.listOfSongs[this.listIndex].name));
          this.$store.commit('setLyric',this.parseLyric(this.listOfSongs[this.listIndex].lyric));
          this.$store.commit('setIsActive',false);
          if(this.loginIn){
            getCollectOfUserId(this.userId)
              .then(res =>{
                for(let item of res){
                  if(item.songId == id){
                    this.$store.commit('setIsActive',true);
                    break;
                  }
                }
              })
          }
        }
      },
      //获取名字前半部分--歌手名
      replaceLName(str){
        let arr = str.split('-');
        return arr[0];
      },
      //获取名字后半部分--歌名
      replaceFName(str){
        let arr = str.split('-');
        return arr[1];
      },
      //解析歌词
      parseLyric(text){
        let lines = text.split("\n");                   //将歌词按行分解成数组
        let pattern = /\[\d{2}:\d{2}.(\d{3}|\d{2})\]/g; //时间格式的正则表达式
        let result = [];                                //返回值
        //对于歌词格式不对的直接返回
        if(!(/\[.+\]/.test(text))){
          return [[0,text]]
        }
        //去掉前面格式不正确的行
        while(!pattern.test(lines[0])){
          lines = lines.slice(1);
        }
        //遍历每一行，形成一个每行带着俩元素的数组，第一个元素是以秒为计算单位的时间，第二个元素是歌词
        for(let item of lines){
          let time = item.match(pattern);  //存前面的时间段
          let value = item.replace(pattern,'');//存后面的歌词
          for(let item1 of time){
            let t = item1.slice(1,-1).split(":");   //取出时间，换算成数组
            if(value!=''){
              result.push([parseInt(t[0],10)*60 + parseFloat(t[1]),value]);
            }
          }
        }
        //按照第一个元素--时间--排序
        result.sort(function(a,b){
          return a[0] - b[0];
        });
        return result;
      },
      //转向歌词页面
      toLyric(){
        this.$router.push({path: `/lyric`});
      },
      //下载音乐
      download() {
        download(this.url)
          .then(res=>{
            let content = res.data;
            let eleLink = document.createElement('a');
            eleLink.download = `${this.artist}-${this.title}.mp3`;
            eleLink.style.display = 'none';
            //把字符内容转换成blob地址
            let blob = new Blob([content]);
            eleLink.href = URL.createObjectURL(blob);
            //把链接地址加到document里
            document.body.appendChild(eleLink);
            //触发点击
            eleLink.click();
            //然后移除掉这个新加的控件
            document.body.removeChild(eleLink);
          })
          .catch(err =>{
            console.log(err);
          })
      },
      //收藏
      collection() {
        if(this.loginIn){
          var params = new URLSearchParams();
          params.append('userId',this.userId);
          params.append('type',0);
          params.append('songId',this.id);
          setCollect(params)
            .then(res =>{
              if(res.code == 1){
                this.$store.commit('setIsActive',true);
                this.notify('收藏成功','success');
              }else if(res.code == 2){
                this.notify('已收藏','warning');
              }else{
                this.notify('收藏失败','error');
              }
            })
        }else{
          this.notify('请先登录','warning');
        }
      }
    }
  }
</script>
<style  lang="scss" scoped>
  @import '../assets/css/play-bar.scss';
</style>
